feat: add Telegram DM topic-mode sessions

tests/hermes_cli/test_commands.py

@@ -109,6 +109,12 @@ class TestResolveCommand:
         assert resolve_command("reload_mcp").name == "reload-mcp"
         assert resolve_command("tasks").name == "agents"
 
+    def test_topic_is_gateway_command(self):
+        topic = resolve_command("topic")
+        assert topic is not None
+        assert topic.name == "topic"
+        assert "topic" in GATEWAY_KNOWN_COMMANDS
+
     def test_leading_slash_stripped(self):
         assert resolve_command("/help").name == "help"
         assert resolve_command("/bg").name == "background"